If what you describe could be achieved in a privacy respecting fashion and on device (using opt-in instead of opt-out) why not (for instance let the server send

If what you describe could be achieved in a privacy respecting fashion and on device (using opt-in instead of opt-out) why not (for instance let the server send 50 add propositions with a one time token and ip obfuscation and let the on device IA choose). What actually happen is that I got vaccum cleaner adds all over youtube & friend for weeks AFTER I ordered one online from a (so far) trusted brick and mortar shop. This is both creepily invasive and very inefficient targeted add.